Leachate Generation Modeling

Alibardi, Luca; Cossu, Raffaello

doi:10.1016/b978-0-12-407721-8.00013-9

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…The transformation process of water into vapors due to solar radiation is referred to as evaporation and by vegetation (plants) as transpiration [ 38 ]. The combination of both phenomena is called evapotranspiration.…”

Section: Msw Management Situation and Climate Conditions In Karachi Pakistanmentioning

confidence: 99%

Municipal Solid Waste Management through Sustainable Landfilling: In View of the Situation in Karachi, Pakistan

Sohoo

Ritzkowski

Guo

et al. 2022

IJERPH

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Open disposal is the most common technique used for municipal solid waste (MSW) management due to the absence of sanitary landfills in Pakistan. The major cities and small towns in Pakistan have become a showcase of negligence and mismanagement of MSW, which results in deterioration of the environmental and social-life quality. Moreover, research has proved that inefficient handling (disposal) of MSW results in uncontrolled emissions of greenhouse gases (GHGs), mainly methane, and adds a significant share in global climate change. This study aims to estimate methane emissions from MSW disposed of at dumpsites and compare the GHG mitigation potential of different landfill strategies in specific climate and waste compositions in Karachi. The GHG estimations are based on lab-scale investigations conducted by simulating landfill conditions through the landfill simulation reactor (LSR) experiment. The synthetic MSW sample representing the composition of MSW generated in Karachi was used in the LSR experiment. Environmental sustainability and GHG mitigation potential of different landfilling strategies was evaluated by analyzing gas formation potential (GP21) and respiration activity (RI4) at the end of the experiment. This study revealed that the quantity of solid waste annually disposed of at dumpsites in Karachi possesses the potential to release about 3.9 Mt CO2-eq. methane (with specific methane potential of 1.8 tCO2-eq./tonne DM disposed) due to the biological decomposition of the organic fraction. Results show that the fresh waste disposed of at landfill sites in Karachi possesses about 92% and 94% higher GP21 and RI4, respectively, than the German allocated criteria for mechanically and biologically treated (MBT) waste for landfills Furthermore, sanitary landfills with post-aeration conditions showed higher GHG mitigation potential and low biological activity in the waste. The second highest GHG mitigation potential and lowest biological activity of the waste was noticed from bioreactor landfills with post-aeration conditions. The third number in GHG mitigation and reduced waste activity was noticed in the waste sampled from bioreactors without aftercare approach. The least GHG mitigation potential was noticed from the uncontrolled waste dumping (existing) approach with high residual gas potential and respiration index level. This lab-scale landfill simulation study can provide baseline data for further research and planning the development of new sustainable landfills in Karachi, Pakistan and in the region.

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Section: Msw Management Situation and Climate Conditions In Karachi Pakistanmentioning

confidence: 99%

Municipal Solid Waste Management through Sustainable Landfilling: In View of the Situation in Karachi, Pakistan

Sohoo

Ritzkowski

Guo

et al. 2022

IJERPH

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“…Estimating flows and hydraulic heads in a landfill is one of the primary goals in design and can further be applied to evaluate to long term performance. Several models have been developed with this purpose, including analytical techniques, field measurements and numerical codes with highlights for HELP (Hydrologic Evaluation for Landfill Performance), MODUELO [6], UNSAT-H and LEACHM. HYDRUS 1D is a free powerful software package with multiple applications for unsaturated soils yet a bit less employed for landfills.…”

Section: Conceptual Modelmentioning

confidence: 99%

Leachate production estimation for a landfill in south of Brazil using Hydrus-1D

Waisczik

Lima

2020

E3S Web Conf.

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The disposal of municipal solid waste (MSW) is currently a great challenge to society mainly due to the threat posed by leachate and gases released from the decomposition sites. Landfills have been widely used for this purpose because their waterproofing, drainage and treatment systems have reduced the risks of soil, water and air contamination. Estimating the amount of leachate and gases generated is extremely important for the control and operation of these systems. In this context, this study was developed in the landfill of Timbó, State of Santa Catarina, Brazil, in order to estimate the generation of leachate and to evaluate the effect of profile composition. HYDRUS-1D was used to simulate unsaturated fluid flow through layers. Data on soil matrix such as characteristic curve and unsaturated hydraulic permeability were obtained from previous studies and pedotransfer functions and the respective curves for MSW were obtained from literature. Thirteen layers were simulated by attributing an atmospheric variably boundary condition on top cover and free drainage on the bottom of the profile for two hydrologic years (2017-2019). HYDRUS-1D overestimated the leachate volume by 33.67% when compared with field data. Layers distribution showed an attenuation effect on leachate production which is consistent with design.

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